Pump.



PatentedSept.12,1916.

INVENTOR @am j By fowzeys,

W. H. COLE.

PUMP.

APPucmou mw ons. 1913.

WITNESSES: d

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UNTED `S'll/QLTES PATENT OFFICE.

WILLIAM H. COLE, lOF ,NEW YORK, N. Y.

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Application filed October 6, 1913.

To all 1c hom it may concern:

Be it known that 'L l/VILLIAM H. COLE, a citizen of the United States of America, residing in the borough of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in Pumps, of which the following is a specification.

This invention relates to pumps, and aims to provide certain improvements therein.

The invention is especially directed to an improved construction ofpump for operating on air or other gases, it being particularly designed for use in connection with gas engine starters operating by compressed air. For such purposes it is highly desir-l y able to provide a pump of compact and simple construction which is capable of working at a pressure of from 150 to 300 pounds, and which is durable in construction so that it can stand continuous operation without deterioration. It has heretofore been proposed to employ what are known as impulse pumps connected directly with the gas engine cylinder for the purpose of charging the reservoir for starting purposes. Such impulse pumps.l however, are not capable of eflicient use except at pressures which are lower than those desirable for starting purposes. I hence provide a power driven pump adapted to be coupled to the gas engine, the pump being adapted to positively compress the fluid in two stages by the use of a pair of pistons mounted in alinement, and driven from a common crank. Fluid is drawn into the larger piston through a ring valve and is compressed through a gland valve into the smaller cylinder and thence is passed to the front of the latter for final compression.

Various points of the invention will be hereinafter more fully defined.

ln the drawings I have shown in longitudinal section a complete pump embodying the invention.

Referring to the drawings, the driving shaft is indicated by the reference letter 03 which carries a crank o4 connected to the pitman o5. The shaft may be given a rotary motion in any suitable way as through a gear 02. The primary piston q is connected zo and formed as a part of the piston rod 7), .he piston operating in a cylinder p which Specification of Letters Patent.

Patented Sept. 12, 1916.

Serial No. 793,654.

head g3 preferably screwing on the cylinder, as shown, andin the piston head are formed,

a series of passagesrg through which air is admitted to the cylinder. The passages q are controlled by a ring valve q2, the edges Aof which lit between. thevcylinderQhead and the endvpf* of the cylinder p. The'ring is thus permitted a suilieient play to open and close satisfactorily by the suctionand compression of 'thelpiston q. The charge of thel cylinder p is on the down strokejpassed into the upper end ofthe smaller cylinder w through a gland valve s, the upper face of which makes contact with a flange s cast upon the cylinder head g3, whileits downward movement is restrained by a ring 8- screwing into an axial flange p* formed on the piston head. The ring s is formed with a series of passagesv 85 for thel passage of air which is compressed through the valve s. The valve s is constructed as a gland with a packing material s3 compressed by a follower s2 so as to make a tight oint around the rod. The gland valve s is opened by the pressure'above it or by friction on the rod when the piston Q descends and is closed in the same manner when the piston 'g ascends.

The cylinder w is preferably secured to the piston head g3 by screwing into the flange p* of the cylinder head. The secondary piston 7' is secured to the lower end of the piston rod p preferably by screwing it onto the end as shown. The piston carries preferably a packing T5 which is held in place by a cage r2 screwing into the piston. The piston is provided with passages r leading to a point above the cage, and the latter is provided with passages 1* leading to the valve seat 17 controlled by a valve r3 mounted upon a stem 'r and preferably loaded with a spring rs adapted to normally maintain it upon its seat.

At the lower end of the cylinder w is mounted a valve casing t which is preferably provided with a plurality of valves t t2 which act as check valves through which the [luid under compression in the smaller cylinder is passed. Suitable cages t3 t* are 'the shaft 03 both pistons are reciprocated.

Upon the ascent of the larger piston air is drawn in around the ring valve Q2 which closes by its own weight or by compression, at the top of the stroke of the piston. Upon 'fthe descent of the larger piston air is compressed through the gland valve s into the upper end of the lower cylinder. Upon ascent of the smaller piston the air partially compressed above it passes into the lower part of the smaller cylinder through the check valve 1", and upon the subsequent descent of the smaller piston the air is forced under considerable pressure through the check valves t t2 into the reservoir or tank.

The pump thus constructed has been found to be extremely efficient and durable in practice. It operates successfully against pressures as high as 300 pounds, and is capable of rapidly lillingr the ordinary tank or reservoir used upon starting systems for gas engines. The air is compressed by positively applied power and the clearances may be made very small, thus avoiding the air cushions which are necessary to impulse pumps, and the loss of compression involved in such cushions. Furthermore, there is no rebound or chatteringr of the pump, and consequently no loss of power from this source.

While I have shown and described the preferred embodiment of the invention it will be understood that I do not wish to be limited thereto, as various changes may be made therein without departing from the spirit of the invention.

What I claim is 1. The combination of a primary cylinder and a secondary cylinder mounted in axial alinement, a pair of pistons therein, a piston rod common to said pistons, a shaft for drivin.;r said pistons. an intake valve leading to the primary cylinder, an exhaust valve directly between the primary cylinder and the `secondary cylinderya check valve in the secondary piston, and an exhaust valve in the secondary cylinder.

2. |The combination of a primary cylinde and a secondary cylinder mounted in axial alinement, an imperforate primary piston mounted in one cylinder, a shaft for driving the same, a piston rod connected to said primary piston, a secondary piston mounted upon said rod, an intake valve for the primary cylinder, an exhaust valve directly between the primary cylinder and the secondary cylinder, a check valve in the secondary piston, and a check valve leading from said secondary cylinder. l

3. TheV combination of a primary cylinder and a secondary cylinder mounted in axial alinement, 'an imperforate primary piston mounted in one cylinder, a shaft for driving the same, a piston rod connected to said primary piston, a secondary piston mounted upon said rod, an intake valve for the primary cylinder, an exhaust valve opening' WILLIAM II. ooLE.

Vitnesses:

E. V. MYERS, FRED WHITE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

